Diaphragm-valve.



Patented Dec. 19, 1911.

UNITED STATES PAENT OFFICE,

GUSTAF DALN, OF. STOCKHOLM, SWEDEN, ASSIG NQ RTO AMERICAN GASACCUUIIATOR COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A'GORPORATION OF NEW JEBSEY.

DIAPHBAGM-VALVE;

specification of Letters Patent.

PatentedDecliQ, 1911.

' To all whom 'it may 001mm:

Be it known that I, GUSTAF DALN, a subject of the King 'of Sweden, residing in Stockholm, Sweden, have invented certain new and useful Im rovements in Diaphragm-Valves, of wh1ch the following is a specification.

In valves of this Character in which a diaphragm is adapted to be depressed against a Seat for closing the Valve, the Seat has heretofore been provided with a coating of tin in order to provide a softer metal against which the diaphragm may contact. The purpose of providing the coating'of tin has been to insure the tiht closingof the Valve opening by the diap ragm'to prevent leakage In diaphragm valves of the 'Character o this nvention thedia hragm-.is usually made of steel and it will e understood that when the same is forcd against the tin coating of the Valve Seat the tin yields sufiiciently to insure complete closure of the Valve: This form 'of construction, however, is objectionable for the reason that after having been used for some time the' coating of tin isworn away and in consequence of which the diaphragm fails to effect' a tight closing or closure of the valve,- -permtt1ng the Valve to leak. In order to prevent or stop such leakage it' has been necessary heretofore to separate the parts of thevalve and retin the Valve Seat, such retinning necessitating the -heating of the Valve body.

'The object of my invention is to obviate' or eliminate the ob ectionable features above pointed out and the -inconvenience and trouble of retinning. To effect such object I employ a disk of suitable soft metal, such as Copper, aluminunror the like, which is placed. above the seat and is provided with openings for' the ya'lve channeL- If the valve is intended for use in a conduit for su plying acetylene gas, I prefer'a disk o aluminum, which has been found to be .most

suitable 'for the pur ose.

A convenient em diment of my invention is illustrated in the accompanying drawings, but it is to be understood that Chan s in the details of construction may be made' within the cope of the s ecific'ation -andclaims without departing om the' principlleof my invention.

In t e drawingsz-:Fi e .1 is a Vertical longitudinal sectlon of arvalve construction .formed on the Valve body. A ring Application med December 4, 1909. Serial No. 531,454.

embodying my invention; Fig. 2 is a' section on the'line'2--2 of Fig. 1; and Fi 3 is a plan view of the relatively soft me al disk which is adapted to be placed above the seat of the Valve.

Referring to the drawings :-1 designates the Valve body which is provided with -the valve seat 2 and-3 designates the diaphragm which is fixed Or secured in position above the Valve Seat by means of a screw plug 4. The diaphragm 3 is adapted to be depressed againsthe Seat 2 b means of a screw 5 for the purpose of closing the valve opening or';

channel.

Above the Valve Seat 2 and resting upon the same is a disk 6 of soft metal, as for instance Cop er', aluminum or the like, the outer edge 0 which rests upon a shoulder 7 plac ed' between the disk 6 and the diaphragm 3. The said ring holds the diaphltagm from the disk 6 when the Valve is open; that a predetermine'd distance away is, when the diaphragm is not depressed by the screw. v

The disk 6 isprovided with an opening 9 which registers with the inlet channel 10 of' the Valve; and it is also provided'with a number of holes or openings 1 1 .which are located over a circular oove or epresslon in the valve Seat with w ich the outlet channel 12 communicates. It -willbe' understood that in operation when the diaphragm 3 is out of contact with the disk 6 the gas passes from the inlet channel 10 under the dia 'phragm 3 and out through the outlet channel 12. i i

phragm consists of a relatively hard metal such as steel, the latter causes a complete closure of the Valve channel when it isdepressed against the disk by-the screw 5.

By reason of 'the fact that the disk 6 c0n-, sists of relatively Soft metal while the dia- Should the disk 6 become, so 'worn as toi prevent the proper closure of the valve b the depression of the diaphragm 3, said dis may be' readily replaced, by another one of 'similar construction merely by' the removal of the screw plu 4:.

While the dis rectly upon the Seat 2 of the Valve, it w1ll be .against thetsaid Seat but ma be supported in Proximity thereto, 'and twill be under- 6 i's shown as. resting di-' 10:3 uI-iderstood that it need not 'rest directly stoofl also that the said disk may be secure in position by any other suitable and desirable means than that shown.

Having thus deserbed my invention, I laim:-

1. ln a diaphragm Valve, the combination With the diaphragm and its Seat of a disk of sot't metal between the diaphragm and the Seat and the Said disk having a hole in registry With the inlet of the Valve Whereby Communication may be established between the inlet and the Outlet of the Valve.

2. In a diaphragm Valve the combination With the diaphragm and its Seat of a disk of Soft metal between the diaphragm and the Seat, and the Said disk having holes theretouha?,

through for establishing communication between the inlet and outlet of the Valve.

3. ln a diaphragm Valve, the combination of a diaphragm member, a Valve Seat, a plate of relatively Soft metal on the Seat, and a ring interposed between the Said diaphragm member and the Said plate; on WhiCh ring the Said daphragm memberais Seated.

In teStmOny, that l Claim the foregoing as my invention, I have Signed my name n presence of tWo Subseribng WitneSseS.

GU STAF DALN. 

